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《Forest Research》 2015-05
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The Variation of Biomass of Larix principis-rupprechtii Plantation along Slopes and It's Scale Effect in the Xiangshuihe Watershed of Liupan Mountains of China,Ningxia

WANG Yun-ni;DENG Xiu-xiu;WANG Yan-hui;CAO Gong-xiang;YU Peng-tao;XIONG Wei;XU Li-hong;Research Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Key Laboratory of Forestry Ecology and Environment of State Forestry Administration;Central South University of Forestry and Technology;  
In this study,one representative slopes covered by the 33-year-old Larix principis-rupprechtii plantation were selected in the small watershed of Xiangshuihe within the semi-humid region of Liupan Mountains,northwest China. Sixteen stand plots were set up continuous along the slope positions of slope top. The biomass was measured in the middle of growing season in 2014. The results showed that the mean biomass on the slope was 118. 59 t / hm2,with a range of 96. 19 139. 18 t / hm2,and the variation range of 42. 99 t/hm2 and the coefficient of variation was0. 12. The variation pattern of biomass along slope positions was shown a trend of first increase then decrease,reached the maximum at the middle-upper slope( horizontal slope length is 87. 71 m). The biomass existed the slope scale effect. It was found that the moving averaged biomass( Y1) increases gradually with the increasing relative horizontal length( X1) of slope section from slope top. The relationship to express this scale effect on the shady slope is Y1= 23. 004X13- 60. 834X12+ 31. 786X1+ 123. 43( R2= 0. 84). The slope average of biomass increased6. 12 t / hm2 per 100 m increase in the slope length on the slope. The ratio of plot biomass to the slope average( Y2)varies nonlinearly along the relative horizontal distance of plots from slope top( X1),with the relation expressed as Y2= 1. 7226X13- 2. 8445X12+ 1. 0338X1+ 1. 0001( R2= 0. 57),This relation can be used to calculate the slope mean biomass from the biomass measured at certain slope position. The slope variation of biomass mentioned above is mainly caused by the comprehensive effect of solar radiationand duration of sunshine with the change of elevation along the slope.
【Fund】: 国家自然科学基金重点项目(41230852);国家自然科学基金重大项目(41390461);; 科技部“十二五”农村领域国家科技计划(2012BAD22B030102);; 国家林业局宁夏六盘山森林生态定位站联合资助
【CateGory Index】: S791.22
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